Brush polyacrylic acid

Lu Y, Mei Y, Schrinner M, Ballauff M, Molle MW, Breu J (2007) In-situ formation of Ag nanoparticles in spherical polyacrylic acid brushes by UV irradiation. J Phys Chem C 111 7676-7681... 

Polyacrylic acid (PAA)—P2VP mixed brushes were prepared by a similar synthetic procedure, by grafting of carboxyl-terminated poly(ferf-butyl acrylate) (PtBuA) and P2VP. Afterwards, PtBuA was hydrolyzed in the presence of p-toluene sulfonic acid. The same strategy was employed to graft mixed PEL brushes on polymer surfaces. In this case plasma treatment was used to functionalize surface of polymer substrates. We introduced amino groups on the surface of PA-6 and PTFE by treatment of the polymer samples with NH3 plasma. Then the carboxyl terminated homopolymers were grafted step by step from the melt to the solid substrate via amide bonds. 

The hydrolysis/elimination reaction of the f-butyl methacrylate brushes is not easily driven to full conversion. Whereas linear f-butyl methacrylate chains are fully converted to polyacrylic acid in dioxane with catalytic amounts of toluene sulfonic acid the cylindrical brush structures precipitated at about 50% conversion (sample PMA-PBMA31-MAS50). Complete cleavage of the ester groups was achieved, however, by dissolving the partial-... 

Instantly after plasma treatment, the LDPE foil is immersed in an aqueous solution of acrylic acid (AA) (10 vol%) and sodium metabisulfite (0.1 wt%) for 24 h at 30 °C, in order to initiate the radical graft polymerisation of AA onto the activated surface. Following AA polymerisation, polyacrylic acid (PAA) brushes are created on the LDPE surface which are suitable for binding antibacterial agents. To remove weakly bound PAA and unreacted AA species on the surface, the grafted foils should be washed with deionised water at 30 °C. 

Currie, E. P. K., Sieval, A. B., Fleer, G. J., Stuart, M. A. C. (2000). Polyacrylic acid Brushes surface pressure and salt-induced swelling. Langmuir, 16, 8324-8333. 

AFM topography images (1 x l am ) of mixed PS-polyacrylic acid brushes treated with different solvent (a) benzene (water contact angle 80°) (b) THF (c) EtOH (water contact angle 40°). Thickness of PS/PAA 15/15 nm. 

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